Looks as if you had dovecot and courier installed on your system at the same time so that the updater configured your system for dovecot instead of coureir. It is not enough that dovecot is not started, it has to be uninstalled, so please remove the dovecot packages with the package manager of the linux distribution and then run the update again by following the manual update instructions which you find in the release notes of ispconfig so that the updater reconfigures your system for courier again.

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